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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 18 — Aug. 30, 2010
  • pp: 18886–18893

30 to 50 ns liquid-crystal optical switches

M. W. Geis, T. M. Lyszczarz, R. M. Osgood, and B. R. Kimball  »View Author Affiliations

Optics Express, Vol. 18, Issue 18, pp. 18886-18893 (2010)

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The optical switching time of twisted-nematic liquid-crystal cells using the liquid crystals, 5CB (C5H11-Ph-Ph-CN), 5OCB(C5H11-O-Ph-Ph-CN) and PCH5 (C5H11-Cy-Ph-CN) have been characterized as a function of temperature, bias voltage and switching voltage, V. The transition time from 90% to 10% transmission scales as V-1.9 and is limited to 30 to 50 ns by the liquid-crystal breakdown electric field, ~100 V μm−1. The time from the initial switching voltage step to 90% transmission, delay time, decreases with increasing bias and switching voltage. For 5CB and 5OCB the delay time approaches a constant value at higher electric fields, >10 V μm−1. Both the transition and delay times decrease with increasing temperature. The minimum transition time at temperatures a few degrees below the nematic-isotropic temperature are 32, 32, and 44 ns and delay times are 44, 25 and 8 ns for 5CB, 5OCB, and PCH5 respectively.

© 2010 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

Original Manuscript: June 25, 2010
Revised Manuscript: August 2, 2010
Manuscript Accepted: August 7, 2010
Published: August 19, 2010

M. W. Geis, T. M. Lyszczarz, R. M. Osgood, and B. R. Kimball, "30 to 50 ns liquid-crystal optical switches," Opt. Express 18, 18886-18893 (2010)

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